某核电站冷源金属拦截网的失效原因
Failure Reason of Metal Trash Net in a Nuclear Power Plant
摘 要
围绕某核电站金属拦截网失效事件展开分析，现场勘查发现铜合金网发生断裂且钢浮筒存在破损，现场取样并采用光学显微镜、扫描电子显微镜等技术分析了该金属拦截网及钢浮筒的失效机制。结果表明：失效金属网成分（Cu-Zn合金）与厂家所述（Cu-Al合金）不符；Cu-Zn合金发生脱成分腐蚀，并在应力和微生物作用下加快腐蚀导致快速断裂，脱成分腐蚀为优先溶解机制；钢浮筒破损主要由电偶腐蚀造成。针对海洋服役环境中的铜合金拦截网提出了相应的保护建议措施。
失效分析
脱成分腐蚀
电偶腐蚀
copper alloy
failure analysis
decomposition corrosion
galvanic corrosion
Abstract
The failure of the metal trash net in a nuclear power plant was analyzed. The site investigation found that the copper alloy mesh was broken and the steel buoy was damaged. The failure mechanism of the metal trash net and steel buoy was analyzed by optical microscopy and scanning electron microscopy. The results show that the composition of the failed metal trash mesh (Cu-Zn alloy) was inconsistent with the composition described by the manufacturer (Cu-Al alloy). Decomposition corrosion of Cu-Zn alloy occurred, and the corrosion accelerated under the action of stress and microorganisms, resulting in rapid fracture. The corrosion mechanism of decomposition corrosion was preferential dissolution. The damage of the steel buoy was mainly caused by galvanic corrosion. Corresponding protection measures were proposed for copper alloy trash net served in marine environment.
中图分类号 TG174 DOI 10.11973/fsyfh-202001013
所属栏目 失效分析
基金项目
收稿日期 2019/8/15
修改稿日期
网络出版日期
作者单位点击查看
引用该论文: HE Guangchu,ZHANG Zhongwei,HONG Feng. Failure Reason of Metal Trash Net in a Nuclear Power Plant[J]. Corrosion & Protection, 2020, 41(1): 68
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参考文献
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【3】关蒙恩. 铜及铜合金在海洋环境下的腐蚀剥落行为研究[J]. 舰船科学技术, 2016, 38(8): 184-186.
【4】孙飞龙, 李晓刚, 卢琳, 等. 铜合金在中国南海深海环境下的腐蚀行为研究[J]. 金属学报, 2013, 49(10): 1211-1218.
【5】王志武, 原素芳. 黄铜腐蚀速度与Cl-浓度的关系[J]. 材料保护, 2004(10): 50-51,66.
【6】洛阳铜加工厂中心实验室金相组编. 铜及铜合金金相图谱[M]. 北京:冶金工业出版社, 1983.
【7】王晓华, 林乐耘, 赵月红, 等. 流动和污染海水诱发并加速铜合金脱成分腐蚀的研究[J]. 稀有金属, 2001(1): 9-13.
【8】POLAN, W. N, POPPLEWELL, et al. Mechanically assisted dezincification of Cu-Zn alloys during stress corrosion in ammoniacal solutions[J]. Journal of the Electrochemical Society, 1979, 126(7): 1299.
【9】PARTHASARATHI A, POLAN N W. Stress corrosion of Cu-Zn and Cu-Zn-Ni alloys: The role of dealloying[J]. Metallurgical Transactions A, 1982, 13(11): 2027-2033.
【10】LANGENEGGER E E, ROBINSON F P A. The role of arsenic in preventing the dezincification of a-brass[J]. Corrosion, 1969, 25(3): 137-146.
【11】KEAR G, BARKER B D, STOKES K R, et al. Electrochemistry of non-aged 90-10 copper-nickel alloy (UNS C70610) as a function of fluid flow: Part 1: Cathodic and anodic characteristics[J]. Electrochim Acta, 2007, 52(5): 1889-1898.
【12】STRANDBERG H, JOHANSSON L G. Some aspects of the atmospheric corrosion of copper in the presence of sodium chloride[J]. Journal of The Electrochemical Society, 1998, 145(4): 1093-1100.
【13】马爱利, 张亚明, 姜胜利, 等. 船用焊接B10铜镍环失效分析[J]. 腐蚀科学与防护技术, 2015, 27(5): 473-482.
【14】张旺宁, 王磊, 刘西西, 等. 35CrMoA抽油杆失效原因分析[J]. 石油工业技术监督, 2018, 34(10): 21-24,31.
【15】KOSEC T, MILOŠEV I, PIHLAR B. Benzotriazole as an inhibitor of brass corrosion in chloride solution[J]. Appl Surf Sci, 2007, 253(22): 8863-8873.
【16】OTMACIC H, TELEGDI J, PAPP K, et al. Protective properties of an inhibitor layer formed on copper in neutral chloride solution[J]. J Appl Electrochem, 2004, 34(5): 545-50.
【17】胡飞, 郭光伟, 温旭光. 铸造黄铜件表面的精饰处理[J]. 材料保护, 2001(4): 27.
【18】李勇, 朱应禄. 黄铜脱锌腐蚀的研究进展[J]. 腐蚀与防护, 2006(5): 222-225,262.
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